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(No Model.) 2 SheetsSheet 1.

G. J. BOGUE. 'DYNAMO REGULATOR.

No. 488,261. Patented Dec. 20, 1892;

WITNESSESi INVE TOR lava 7% Hm ATTORNEY (No Model.) 2 Sheets.Sl 1-eet 2.

G. J. BOGUE. DYNAMO REGULATOR.

- No. 488,261. Patented Dec. 20, 1892.

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UNrTnn STATES PATENT OFFICE.

CHARLES J. BOGUE, OF NEW YORK, N. Y.

DYNAMO-REGU LATO R.

SPECIFICATION forming part of Letters Patent No. 488,261, dated December2-0, 1892.

Application filed February 18, 1892. Serial No. 421,952. (No model.)

To all whom, it may concern.-

Be it known that 1, CHARLES .I. BOGUE, of New York, county and State ofNew York, have invented a certain new and useful Improvement inDynamo-Regulators, of which the following is a specification.

This invention relates to automatic regulators for dynamo electricmachines and it consists of pole pieces movable circumferentiallyrelatively to the armature.

I will describe a regulator embodying my improvement and then point outthenovel features in claims.

In the accompanying drawings, Figure 1 is a side elevation, partly insection, of a dynamo embodying my improvement. Fig. 2 is a transversevertical section thereof and also showing an automatic cut out inposition. Fig. 3 is a detail showing a field pole piece.

Referring by letter to the drawings, A designates the frame of a dynamoin which are supported the field magnets A each consisting of a core aupon which the coils a are wound, and a segmental circumferentiallymovable pole piece A Each pole piece is substantially in the form of acrescent and may have a longitudinal rib a formed on its rear surfaceadapted to engage in a channel a in a block a on the core a. Theopposite adjacent ends of the pole pieces A are secured together by aplate a which may be of brass, and attached to the pole pieces by meansof screws.

B designates the armature rotating within the magnetic field andcarrying the commutator B. Brushes B are mounted on a frame B which issupported by the frame A and is capable of being oscillated to adjustthe brushes on the commutator. oscillating the frame B I have shown theframe as provided with a gear 6 having its shaft extending through aportion of the frame A and provided at its outer end with a crank orhand wheel 5 Having described the dynamo generally, I will now describethe means for automatically regulating the electric current.

0 designates a line wire leading from one of the brushes B and Cdesignates, as here shown, the return wire leading to the oppo sitebrush B Lamps 0 are included in the circuit C G. The line wire 0 has apart c As a means for.

leading to an electro-magnet O and from this clectro-magnet the wire 0may lead directly to the lamps C or as I have shown it, in Fig. 2, anautomatic cut out 0 may be within the circuit. In this event, the wire Cleading from the electro-magnet 0 extends through the electro-magnet Othence to the lamps, and the portion of the wire 0 leading to theelectro-magnet O has a branch a secured to a fixed contact piece 0 InFig. 1, I have omitted the out out, but have shown a portion of wire afor connection therewith. From the contact piece 0 the current isthrough a movable contact piece 0 from which a wire 0 extends to theportion of the wire 0, which leads from the electro-magnet G The movablecontact 0 is secured to cores 0 of the elec-' tro-magnets G andobviously the circuit will be broken through the contacts 0 0 when themagnet C is energized. The electro-magnet C is secured to the upperportion of the frame A.

D shows a lever fulcrumed to a standard D extending from the frame A andD shows a rod or bar pivotally connected at one end to one end of thelever D and pivotally engaging at its opposite end, with one of the polepieces A As here shown a slotted arm 01 extends outward from a polepiece A and the rod or bar D is engaged with this arm by means of a'pinpassing through said rod or bar and through the slot in the arm d. Aretracting spring (1 extends from the opposite end of the lever D to theframe A, and the core D of the electro-magnet G has a pivotal engagementwith the lever D between the standard D and the rod or bar D Theoperation of the regulator is as follows: When all the lamps in acircuit are in operation, with a normal current the segmental polepieces remain stationary. Under an increase of current, however, due tothe cutting out of one or more of the lamps, the overload of currentenergizes the electro-magnet C which will draw the core D downward andconsequently change the position of the segmental pole pieces relativelyto the armature B. When the current strength is diminished, the poleswill be returned to their normal position through the agency of thespring (1.

When the automatic cut-out is employed in the circuit, an overload ofcurrent will energize the magnets C and break the circuit i at c c andthusclirect all of the current through the electro-magnet C and cause itto shift the pole pieces A as before described.

Having described my invention what I claim is:

1. In a dynamo electric machine the combination with an armature and anelectromagnet in the circuit of said dynamo of pole pieces movablecircumferentially by an overload of current in the electro-magnet,subtially as specified.

2. In a dynamo electric machine, the combination with an armature, ofcircumferentially movable pole pieces, an electric circuit comprising anelectro-magnet a lever operated in. one direction by the electro-magnctand a connection between said lever and the

